Improve RUI3 AT command compatibility

• Add AT+FIRMWAREVER command
• Add option to set application version with

snprintf(g_custom_fw_ver,63,"RAK11200 ENV V%d.%d.%d",SW_VERSION_1,SW_VERSION_2,SW_VERSION_3);

AT+VER=? command will show WisBlock API V2 version
AT+FIRMWAREVER=? command will show application version. Defaults to "Custom firmware"

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• Add AT+SYNCWORD command
  AT+SYNCWORD=? will show current sync word
  AT+SYNCWORD=244B sets sync word to 244B

Add RUI3 AT command AT+FIRMWAREVER

Add option to set application version with

snprintf(g_custom_fw_ver,63,"RAK11200 ENV V%d.%d.%d",SW_VERSION_1,SW_VERSION_2,SW_VERSION_3);

AT+VER=? command will show WisBlock API V2 version
AT+FIRMWAREVER=? command will show application version. Defaults to "Custom firmware"

AT command parsing and default fPort changes

Allow upper and lower case and special characters in AT commands after the "="
Change LoRaWAN default fPort from 0 to 1

Fix dependency to CayenneLPP

Ownership of library has changed, PIO couldn't find the library

Rework AT commands

• Make AT+PBW and AT+P2P compatible with WisToolBox
• Support RAK11300 with Arduino-Pico BSP

Make ESP32 work with WisBlock-API-V2

Not 100% tested on RAK11200, but should work

Fix AT+PRECV command

Set RX_CONTINOUS depending on receive mode and re-initialize the LoRa transceiver

New feature/bug-fix

• Fix missing return value for ATC commands
• Add option to re-init LoRaWAN stack

New features & Fix more compatibility problems with latest WisToolBox version

• Give correct ATC+.... return instead of only AT+... for custom AT commands
• Add AT command for force OTA DFU mode on RAK4631
• Add re-initialize function for LoRaWAN (fix problem with confirmed msg NAK)

Smaller problem fixes

• Add g_rx_fin_result = false; for LoRa P2P and call TX callback if CAD returns channel activity found
• Fix compatibility problem with latest WisToolBox version by changeing AT error return values from +CME... to the new error strings